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    <title>Document</title>
    <script>
        // 题目描述：把下面数组的首尾两个元素互换
        let arr = ["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"];
        //  var temp=arr[0];
        //  arr[0]=arr[arr.length-1];
        //  arr[arr.length-1]=temp;
        [arr[0],arr[arr.length-1]]=[arr[arr.length-1],arr[0]]
         console.log(arr);
    </script>
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